posts - Read For Learn

Post preview mechanism architecture

Even if you hit just one button for “Preview” it may ends in 2 different “routes”. The one is something like http://example.com/postname/?preview=true The second is something like: http://example.com/postname/?preview_id=152&preview_nonce=xxx&preview=true so the first contains preview query argument, the second contains preview_id preview_nonce preview query arguments. preview query argument tells WordPress to allow visualization of non-published posts to … Read more

How to add category to: ‘wp-admin/post-new.php’?

Dave James Miller over at GitHub nailed this one for me. None of the work is from me, I’m just posting his code wrapped into a plguin since it works perfectly as advertised: <?php /** * Plugin Name: Set default category from url parameter * Plugin URI: https://gist.github.com/davejamesmiller/1966543 * Description: enables you to setup new … Read more

Count posts within a custom post type and specific taxonomy and terms?

An alternative solution using WP_Query would be: $args = array( ‘cat’ => 4, ‘post_type’ => ‘videos’ ); $the_query = new WP_Query( $args ); echo $the_query->found_posts;

Access post from post id in URL

Post can be accessed using post id by passing it as page_id query param to index.php. e.g. http://wordpress.loc/index.php?page_id=16 Or simply http://wordpress.loc/?page_id=16

Set Default Listing “View” in Admin

Although having the feature of persistent settings in core is nice, it may take quite a while before it’s actually accepted. WordPress 3.5 is still quite far away. So let’s augment the global $_REQUEST array instead. add_action( ‘load-edit.php’, ‘wpse34956_force_excerpt’ ); function wpse34956_force_excerpt() { $_REQUEST[‘mode’] = ‘excerpt’; } This will lock up modes, forcing excerpt mode … Read more

How to prevent a post from being deleted?

Don’t let the action die, just do a redirect (to wherever you’d like): function wpse_92155_before_delete_post() { wp_redirect(admin_url(‘edit.php’)); exit(); } // function wpse_92155_before_delete_post add_action(‘before_delete_post’, ‘wpse_92155_before_delete_post’, 1);

Delete Associated Media Upon Page Deletion

How about this? It adapts an example on the get_posts() function reference page. function delete_post_media( $post_id ) { $attachments = get_posts( array( ‘post_type’ => ‘attachment’, ‘posts_per_page’ => -1, ‘post_status’ => ‘any’, ‘post_parent’ => $post_id ) ); foreach ( $attachments as $attachment ) { if ( false === wp_delete_attachment( $attachment->ID ) ) { // Log failure … Read more

Difference between an archive and a page listing posts

Archive Page An archive page is part of the WordPress Template Hierarchy, and is the template file WordPress uses to display the archive index list for a given post type. The custom post type archive template hierarchy is as follows: archive-{posttype}.php archive.php index.php WordPress uses the query parameters to output this page, and posts are … Read more

simply loop through posts

Because you’re on a page, that’s only going to display the query for that page. As such, you’d have to create a new query to bring in the posts you want. Replace your loop with this: <?php $args = array( ‘post_type’ => ‘post’ ); $post_query = new WP_Query($args); if($post_query->have_posts() ) { while($post_query->have_posts() ) { $post_query->the_post(); … Read more

Changing the post date and time with function

Call wp_update_post() with a special value for ‘post_date’ and ‘post_date_gmt’: $time = current_time(‘mysql’); wp_update_post( array ( ‘ID’ => 123, // ID of the post to update ‘post_date’ => $time, ‘post_date_gmt’ => get_gmt_from_date( $time ) ) );

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